Some diseases are inherited. Others are caused by materials in the environment. Still others are produced by organisms such as bacteria and fungi.
Some infectious diseases are spread from one person to another through coughing, sneezing or physical contact. Other infectious disease are spread through contaminated water or food. Still others are spread by infected animals.
Your body's most important nonspecific defense is the skin.
The inflammatory response is a nonspecific defense reaction to tissue damage caused by injury or infection.
Once the body has been exposed to a pathogen, millions of memory B and T cells remain capable of producing specific antibodies to that pathogen.
When the immune system makes a mistake and attacks the body's own cells, ti produces an autoimmune disease.
Cancers begin when something goes wrong with the controls that normally regulate cell growth and division.
Treatments for cancer fall into three general categories; surgery, radiation, therapy and drug therapy.
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